Transitions Optical has been hit with another lawsuit in the U.S. alleging that it monopolizes the market. The suit was filed by Vision-Ease Lens, a division of Insight Equity A.P.X., in District Court in Delware. Vision Ease accuses Transitions controls more than 85 percent of the photochromic lens market, violating U.S. antitrust laws and Florida laws regarding deceptive and unfair trade practices. Transitions, it alleges, has caused reduced competition, higher prices and restricted production.